We'd normally say something like "learn to code, then try again", but as you apparently know at least a little...
Of course it's possible. Whether you could accomplish it is another story entirely.
If what you wrote was a 3D game where you could get into and out of vehicles as well as drive them around, then maybe. The hardest part would be integrating it with the engine, which you would probably find incredibly daunting.

Oh, and the stock response to the "vehicles in Cube 2" question is "you're already in one, now shut up and drive" (in reference to the Ironsnout model, which was current at the time). ;)

You can use Syntensity, racing is integrated.

I guess you could use CubeScript to have a trigger that changes your playermodel to a car when you get into the car, and when you get out, it changes it back to whatever you had before. Or you could make it like Transformers, and you transform into a car. Just random thoughts.

A drivable car is integrated in intensity engine.
there was also a mod called sauermod wich had a drivable buggy, but the mod no more exists.

would that car jump too?